Centering-tool



(No Model.)

J. N. WAITE.

GENTER ING TOOL.

Patented Nov. 9, 1886.

" UNITED STAT S" PATENT OFFICE.

JAMES N. \VAITE, OF HARTFORD, CONNECTICUT.

CENTERlNG-TOOL.

fiPECIFICATION forming part of Letters Patent No; 352,169, dated November 9, 1886.

i Application filed September 11, 1886. Serial No. 213,306. (No model.)

To aZZ whom it may concern:

Be it known that I, JAMES N. WAITE, of the city and county of Hartford, Connecticut, have invented certain new and useful Improvements in Centering-Tools, which are described in the following specification and illustrated in the accompanying drawings.

This invention is designed to facilitate the operation of finding and punching a centerpoint upon the end of a cylindrical or otherwise symmetrical rod or bar of metal, and

comprises a center-punch, a centering-block, and a frame, by means of which said punch and block are guided and adjustedin a peculiar: manner.

The best mode in which I have contemplated the application of my invention is shown in the drawings, in which-f Figure 1 is a side view of my improved centering-tool. Fig. 2 is a bottom view of the same; and Fig. 3 is a section on w x in Fig. 2,

with the addition of a metallic rod in position,

showing the manner of using the tool.

In these views, the numeral 1 denotes the frame of the tool. This frame consists ofa single piece of iron of irregular form, and has two arms, 2 and 3, which radiate from a common point; but in the vicinity of that point the frame is re-entrant and presents two plane faces, which are at a right angle with each other,and are also at right angles with the longitudinal axes of said arms, respectively.-

Arm 2 has a central longitudinal perforation, in which plays the center-punch 4. Arm 3 has a like perforation, in which the stem 5 of the centering-block 6, being provided with a screw-thread, is movable lengthwise by the rotation of a knurled drawing-nut, 7, which is let into arm 3, the latter being cut away for the accommodation of that nut. The outer end of arm 3 is split into two parts, which lie upon opposite sides of stem 5, and can be drawn together against that stem as a clamp by means of screw 8.

Centering-blockfi is of symmetrical form, and has 'five plane sides, while the remaining side, which is the front side of the block, consists of two re-entrant faces, which form a deep V- groove or month for the reception of the stock whichis to be centered.

Upon one side of block 6 is a graduated scale, (shown in Fig. 1,) upon which is indicated, by reference to an index-mark, 9, upon the contiguous edge of frame 1, the diameter, in inches or fractions of an inch, of the bar or rod of metal which can be centeredby this tool in the position in which the same may be adjusted. V The drawings show the adjustment for centering one inch stock.

All parts of this tool excepting frame 1 are made of steel.

Such being the construction of the too], its operation is as follows: The stock which is to be centered is held in a perpendicular position by a vise or other convenient means. 'By

use of nut7, acting on stem 5, block 6 is moved backward or forward to such a position that mark 9 indicates upon the graduated scale the diameter of the stock which is to be centered. The block is then fixed in that position relatively to frame 1 by clamping the end of arm 3 upon stem 5 by means of screw 8. The end portion of the stock is then laidinto the mouth of block 6, and the center-punch is placed in contact therewith, as shown in Fig. 3. Ablow .upon the upper end of punch 4. completes the a frame which is provided with two holes in clined toward veach other at a right angle for the adjustment and guidance of said block and punch,respectively, substantially in the manner and for the purpose specified.

2. A frame and a center-punch which is movable through a hole in said frame, in combination with a centering-block having a mouth in the form of'a V-groove and provided with a stem which is movable through another hole in said frame, andis adjustable therein'by a nut and clamp, substantially in the manner and for the purpose specified.

3. In a centeringtool, a centeringblock provided with a s e1ew-stem,and having a mouth in the form of a straight groove whose width diminishes as its depth increases, substnntially in the manner and for the purpose specified.

4. In a centering-tool, a centering-block provided with a screw-stem, a mouth in the form of a straight groove whose width diminishes as its depth increases, and a graduated scale indicating the capacity of said mouth at IO different depths, substantially in the manner and for the purpose specified.

In testimony whereof I have hereunto set my name in the presence of two witnesses. J AMES N. WAITE.

Witnesses:

WILLARD EDDY, RICHARD H. IVLXTHER. 

